HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
MailerLite is an email marketing tool and website builder for businesses of all shapes and sizes.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Phusion Passenger is a free web server and application server with support for Ruby, Python and Node.js.
Ruby on Rails is a server-side web application framework written in Ruby under the MIT License.